70 ILCS 810/28
For the purpose of creating a fund as prescribed in Section 27, any district by resolution of its board may incur an indebtedness and issue bonds for the indebtedness in an amount or amounts not exceeding in the aggregate $14,000,000 outstanding at any one time. The bonds shall bear interest at a rate of not more than that permitted in the Bond Authorization Act and shall mature within 20 years from the date of issuance. The board may provide that the resolution or resolutions authorizing the issue of the bonds shall be operative, effective, and valid without the submission of the resolution or resolutions to the voters of the district for approval. The board of the district shall, before or at the time of issuing the bonds, provide for the collection of a direct annual tax on all the taxable property in the district, sufficient to pay and discharge the principal of the bonds at maturity and to pay the interest on the bonds as it falls due.
70 ILCS 810/28